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If you think it's actually coming from UNDER the dash, like near your feet... you could check the rubber grommet that the tranny shift cable passes through. It's right next to/below the accelerator pedal.
Kwik is right, You probably have a small hole in the urethane seal between the windshield and pinch weld, You can find the leak by removing the cowl cover and spray the bottom edge of the windshield where the urethane seal is with a soap and water mix, then from the inside use the air compressor set at about 50lbs, blow some air along the bottom, you usually can find the leak pretty quick. If you do it yourself, make sure you use urethane. Are shop charges about $30.00 to $50.00. Also, if you have a large area that you find leaking, A good practice is to remove the windshield, clean the pinch weld and the windshield of old urethane, prime both then reset with new urethane. Let the glass shop do the removal. Remember the windshield is what the air bag inflates against (on the passenger side) in a collision to help keep you in inside. Good luck.
I went to a autoglass shop and they dont think its the windshield, any other possible ideas of what it could be?
They think it maybe that the cowl drains are clogged and its flowing into the heating duct or something like that im not sure, I still have to remove the cowl and look.
Sometime when its not the windshield, It can be body seams that can cause a leak, Have seen a few of them before, most of the time will being trying to find it the darn leak. You can try to do your own water test with a garden hose, Have one person on the outside with the hose on low, and start at the bottom of the windshield and slowly work up, while another person inside with a flashlight looking for the leak.
Another trick to do is hook an air line into the vehicle and then wash the exterior with a very soapy solution, then look for air bubbles. You may be surpirsed at what you find.
When I worked at a Chrysler dealer, I spent many hours in the trucks with a flaslight looking for leaks until I discovered the air pressure and soapy water routine. Cut many hours of searching.
When you soap it up, only do a small section at a time. You will probalbly find leaks around the w/s, doors and will really see some leaks on the passenger side, near the intake vent. Be careful what you plug there. Water plowing there is what flushes out the heater and a/c. If it did not flush, your a/c would stink to high heaven.